Electromagnetic sound reproducer



' Oct. 14, 1930. P, ROOTES 1,778,402

ELECTROMAGNETI C SOUND REPRODUCER Filed June 11 1926 3 Sheets-Sheet 1 L; A 4 NJ IN VEN TOR.

BY w ATTORNEY Oct. 14, 1930.'

P. ROOTES 1,778,402

ELECTROMAGNETIC SOUND REPRODUCER Filed June 11 1926 3 Sheets-Sheet .2

INVENTOR.

I Get. 14, 1930. P RoTEs 1,778,402

ELECTROMAGNETIC SOUND REPRODUCER Filed June 11, 1926 5 Sheets-Sheet BY fi ATTORNEY Patent d" a. 14, 1930 UNITED STATES PATENT OFFICE minor acorns, or wmns'on, ENGLAND, assionon TO BRANDES LABORATORIES, me,

or NEWARK, NEW. JERSEY, a oonronarIoN or new JERSEY ELECTROMAGNETIC SOUND REPBODUGEB Application t lled June 11,

"My invention relates broadly to electromagnetic sound" reproducing systems and more particularly to a cabinet apparatus and mounting for broadcast receiving apparatus.

One of the objects of my invention is to provide a simplified mounting for an electro magnetic sound reproducer in association with signal receiving apparatus.

Another object of my invention is to provide a unitary electromagnetic sound reproducer structure which may be mounted within a cabinet by a'simplified method of inserting the electro agnetic sound reproducer within the front of a panel structure in such manner that the reproducer-may be readily. removed for inspection and repa r fromtime to time.

Another object of my invention-is to provide a removable '-electromagnetic;sound re producer structure which may be read l mounted in a cabinet in association wit broadcast receiving apparatus and removed as a unitary structure from the cabinet w1th'- out disturbing the delicate parts of the electromagnetic sound reproducer and interfering with the adjustment thereof A further object of my invention is to provide an electromagnetic soundreproducer 1n which a conical diaphragm is operated from an electromagnetic driver, a frame member beingprovided for the several parts of the electromagnetic sound reproducer, which frame member is readily insertable into and removable from the cabinet structure for inspection and repair of the several parts of the sound reproducer.

A still further object of my invention is to provide a frame structure for an electromagnetic sound reproducer which is readily mountable within an apertured panel associated with a radio receiving apparatus cabinet with a latch mechanism for maintaining the frame'structure in position within the panel in such manner that the electromagnetic sound. reproducer is readily removable for repair or adjustment from time to time.

My invention will be more clearly understoo the specification hereinafter following by reterring to the accompanying drawings wherein:

1926. Serial No. 115,210.

Fig. 1 shows a plan view of the electroma netic sound reproducer of my invention wit parts.- partially in cross-section; Fig. 2 is a' ront view of the sound reproducer looking fromthe front of the panelstructure; Fig. 3v

is a side elevation of the electromagnetic sound rzproducer with the diaphragm and frame structure partially broken away andshown in cross-section to illustrate more clearly the removable mounting of the sound reproducer within the panel; Fig. 4 is a rear view of the electromagnetic sound reproducer the receiving cabinet ;-Fig. 6 shows the frame of the electromagnetic sound reproducer slightl canted in position to be removed from t e panel structure; and Fig. 7 is a view illustrating the several parts of the electromagnetic soundreproducer-in the process of removal from the panel structure.

Heretofore in the mountin of an electromagnetic sound-reproduce! of the conical diaphragm type in a cabinet it has been the practice to mount the electromagnetic driver separately from the sound reproducing dia phragm. This arrangement requires tedious adjustment of the driving link, the apex of the conical diaphragm and the armature of the electromagnetic driver." Extreme care must be taken with respect to thespaciahre lation between the armature and the pole pieces of the electromagnetic driver; Where the driver and the diaphragm are mounted independently on separate supporting structures there is tendency for many irregularities to exist in the arrangement of parts. Considerable difficulty has also been experienced in mounting the independent parts within a cabine" ucture, for it has required the tedious between 1 link and the open or the cone nragm often there is very i in a cabinet structure which a appa atus meat may be I provide a unit..- both the elects ca frame support for a sound reproducing diaphragm. The structure is arranged for ready insertion into the panel of a rad1o receivin set cabinet with means for permitting t e ready removal of the entire structure for inspection and repair.

Referring to the drawings in more detail reference character 1 designates generally a cabinet which may house broadcast receiving apparatus, Where the apparatus is provided with a conical panel 2. A panel 3 is provided in the apparatus into which the electromagnetic sound reproducer may be inserted from the front thereof. The electromagnetic sound reproducer includes a conical diaphragm 4 supported at its periphery.

by a frame support 6 having a rim member 7 set therein. An ornamental grille structure 5 is provided which is insertable into the front of the panel structure 3 flush with the plane of the panel structure. A plurality of arms 9 extendfrom selected points around the frame structure 6 and provide a supporting seat 10 for an electromagnetic driver contained within housings 11 and 12.

Located around the eriphery of the aperture 8 in the panel 3 provide a plurality of abutment strips 14-, 15, 18 and 17 having" a contour similar tothe contour of the aperture 8 against which the rear face of the supporting rim 6 may abut for securing a rigid mounting of theremovable electromagnetic sound reproducer apparatus within the apertured panel. A. lip member 18 is secured to the rear wall of the frame structure 6 enablin the sound reproducer to be readily seate within the apertured panel. Diametrically opposite the depending lip 18 1 provide a latch member 19, the movement of which is governed and limited by means of a guide and stop 20 which forms an abut ment with an extending lipon the latch 19. The latch 19 is normally spring pressed outwardly by means oispring 21 in such man nor that the latch 19 tends to extend behind the rear wall of panel 3 in the same manner in which the depending lip 18 extends behind the rear wall or": panel 3.

in order to provide for the ready removal of the electromagnetic sound reproducer apparatus from the panel structure a portion of the panel 3 out away at 22 at a slight angle. This permits the frame structure of sound reproducer to he kl the removal thereof from panel. as represented more Q l6.

' urns of the electroan ornamental an outer periphcontour of tee rap t '1' W Ullifi is read and into these sockets ball members 23 pressed by spring 24 may be snapped. In removing the electromagnetic sound re roducer from the cabinet structure a thin e ged tool is utilized to press back the ball members 23 for the quick removal of the grille 5. The tool is then passed around the angular wall 22' of aperture 8 for moving down the latch device 19 for permitting the ready removal of the electromagnetic sound reproducer from the cabinet structure.

In Fig. 4 I have shown the arrangement of the-electromagnetic sound reproducer as-removably mounted in panel 3. The construction of the removable loud speaker apparatus permits ready assembly of the sound reproducer within the radio receiving appa ratus cabinet and introduces a considerable saving in the time required for assembling the apparatus at the same time that inspection and repair may be conveniently made at required intervals without disturbing the adjustment of the acoustical apparatus.

By latching the sound reproducer in position with respect to the sounding board or panel structure an acoustic coupling is provided between the conical shaped sound reproducing diaphragm and the sounding board. The complete electromagnetic sound reproducer is readily removed from the panel structure and the coupling reestablished when the sound reproducer is again latched into the sounding board. The acoustic coupling thus provided secures a cooperative eilect be- 26 at spaced intervals about its periphery tween the conical shaped sound reproducing v diaphragm and the panel or sounding board into which the sound reproducer is inserted or moved to a position where the conical shaped sound reproducing diaphragm has its perlpheral edge in a position substantially within the lane of the sounding board.

While I ave illustrated my invention in certain preferred embodiments I desire it to be understood that modifications may be made without departing from the spirit of my invention. For example, I have illustrated an elliptical cone diaphragm mounted on a horizontal axis within the radio receiving appa= ratus cabinet structure.

stood that other shapes of diaphragm may be employed or that the elliptical cone may be mounted on a vertical axis within a cabinet structure, the several parts of the frame being rearranged to conform with the modified mounting. Other and further modifications may be made, and I intend no limita tions upon the invention other. than are imposed by the scope of the'appended claims.

What i claim as new and desire to secure l 'atent of the United is as lit will be under-"0 said apertured panel structure, a conical shaped sound reproducing diaphragm, an electromagnetic driver carried by said frame member, and a plurality of abutments carried by said panel structure for engagement by said frame member for supporting said frame member in said panel structure for acoustically coupling said conical shaped sound reproducing diaphragm with said panel structure.

2 A sound reproducer including an apertured sounding board, a frame structure arranged to be removably and detachably mounted in said sounding board, said frame structure carrying a conical shaped sound reproducing diaphragm and an electromagnetic driver therefor, 21 flange member posinetic driver therefor; a plurality of flange members secured to the rear of said apertured sounding board and projecting inwardly therefrom, and a separate flange member secured to the peripheral edge of said frame structure; and located between a pair of said first mentioned flange members said flange members operating to align said ame structure in the plane of said sounding board.

4. A sound reproducer including an apertured sounding board, a'frame structure arranged to be removably and detachably mounted in said sounding board, said frame structure carrying a conical shaped sound reproducing diaphragm and an electromagnetic driver therefor, a plurality of fiat strip members each having a contour conforming to the shape of said apertured sounding board for providin ture, an latch mechanism carried by said frame structure at diametrically opposite points there- .on for lockin said frame structure within said aperture sounding board in abutment with said strip members.

In testimony whereof I afiix my signature.

PERCY ROUTES.

abutments for said frame struca depending flange member and 

